Excessive oil consumption (sbc)? - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 10-25-2012, 10:09 PM
Registered User
 
Join Date: Aug 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Excessive oil consumption (sbc)?

This is a fairly fresh .030" 406, there is no blow-by, plugs are good & clean, no leaks, but it'll go through about a quart in 150 miles, I'm running baffled VCs with PCV on one & a breather on the other, any ideas?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 10-25-2012, 10:26 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 7,438
Wiki Edits: 0

Thanks: 292
Thanked 709 Times in 684 Posts
What weight oil? good oil pressure?It has to be going somewhere,there has to be a trail. recheck plugs.back of intake is a common leak.
no smoke at all?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-25-2012, 11:28 PM
Registered User
 
Join Date: Aug 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
No smoke at all, pipes are clean, no soot, intake rails are dry, the only sign i see is oil on the threads of plugs, wondering if its the rings, but there no blow-by what so ever, has me puzzled. VC gaskets are those blue rubber/tin units, its all dry around that area.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 10-26-2012, 01:39 AM
blwn31's Avatar
Registered User
 
Last photo:
Join Date: Mar 2011
Location: Placerville,CA
Posts: 143
Wiki Edits: 0

Thanks: 0
Thanked 9 Times in 9 Posts
Intake rocker studs are an easy place to suck lots of oil. Ask me how I know, on second thought lets not. If everything else checks out, rings.

Keith
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 10-26-2012, 08:09 AM
Registered User
 
Join Date: Dec 2009
Location: illinois
Posts: 373
Wiki Edits: 0

Thanks: 1
Thanked 31 Times in 31 Posts
Not in any particular order :
valve guides
rocker studs
intake gskts
rings
index a couple plugs & check to see if top or bottom is darker
run a compression & leakdown test
this SHOULD[??] help you isolate your problem

dave
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 10-27-2012, 09:38 AM
Registered User
 
Join Date: Aug 2012
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
The heads are iron eagles with screw in studs, i'm really thinking rings at this point.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 10-28-2012, 11:42 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,429
Wiki Edits: 0

Thanks: 1
Thanked 16 Times in 16 Posts
400 blocks if not preped correctly they will burn oil as the are preety weak block. Do aleak down test at TDC and see where your at.

Go over this link and check out the pics on page 3

Mike Lewis & other engine builders - Chevelle Tech
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 10-28-2012, 04:37 PM
Registered User
 
Join Date: Jun 2010
Location: TX
Posts: 1,159
Wiki Edits: 0

Thanks: 0
Thanked 101 Times in 93 Posts
Never use forged "racing" pistons that use 1/16" top and second rings in engine that is driven daily. . The 1/16" rings are low tension rings to be used on low silicon forged pistons in high RPM racing engines. The 1/16" rings have poor oil control at low RPM. Always use forged pistons that use 5/64" top and second rings. Those type pistons set up at .002" - .0035" clearance and utilize oil return slots instead of return holes in the oil ring lands.

If one insist on using 1/16" low tension rings, a block plate should be used when honing the bores. The 1/16" low tension rings require perfectly round cylinder bores and the ends should not be file fitted. File fitting makes rings progressively egg shaped. Select the 1/16" low tension rings using a bore light and use only the rings from several sets that fit the bores as is. In drag racing engines using thin low tension rings, block filler such as "Hard Blok" should be considered.

Automakers today are using low tension metric rings in new cars to improve gas milage.

Last edited by MouseFink; 10-28-2012 at 04:44 PM.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 10-28-2012, 05:09 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 7,438
Wiki Edits: 0

Thanks: 292
Thanked 709 Times in 684 Posts
mouse,you set piston to wall clearance at 002-0035 for a forged piston?
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 10-29-2012, 04:52 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,429
Wiki Edits: 0

Thanks: 1
Thanked 16 Times in 16 Posts
Quote:
Originally Posted by MouseFink View Post
Never use forged "racing" pistons that use 1/16" top and second rings in engine that is driven daily. . The 1/16" rings are low tension rings to be used on low silicon forged pistons in high RPM racing engines. The 1/16" rings have poor oil control at low RPM. Always use forged pistons that use 5/64" top and second rings. Those type pistons set up at .002" - .0035" clearance and utilize oil return slots instead of return holes in the oil ring lands.

If one insist on using 1/16" low tension rings, a block plate should be used when honing the bores. The 1/16" low tension rings require perfectly round cylinder bores and the ends should not be file fitted. File fitting makes rings progressively egg shaped. Select the 1/16" low tension rings using a bore light and use only the rings from several sets that fit the bores as is. In drag racing engines using thin low tension rings, block filler such as "Hard Blok" should be considered.

Automakers today are using low tension metric rings in new cars to improve gas milage.
Are you serious ?? I have built alot of street and strip engines over the years with 1/16 ring packs and never had any issues with oil control.

Quote:
The 1/16" low tension rings require perfectly round cylinder bores and the ends should not be file fitted. File fitting makes rings progressively egg shaped.
WTH are you talking about I have used file fit rings in just about every engine I have built with zero problems.

I am a believer in torque plate honing and using a good hone and the proper stones to do the job correctly. Alot of shops are using substandard hones to hone they just don't work.

I am careful on my choice of oil control ring anf their tension.

If you are having to fill a block your using the wrong block.

Where did you ever come up with this false imformation ???????
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 10-29-2012, 06:46 AM
Registered User
 
Join Date: Jun 2010
Location: TX
Posts: 1,159
Wiki Edits: 0

Thanks: 0
Thanked 101 Times in 93 Posts
Quote:
Originally Posted by vinniekq2 View Post
mouse,you set piston to wall clearance at 002-0035 for a forged piston?
Low silicon forged pistons that use 5/64" top and second rings need .002" - .0035" clearance due to a more controlled expansion rate. They are made of 4032 or VMS-75 forged 11% silicon/aluminum alloy with 5/64" top and second rings. Speed Pro L2256F for example

High silicon forged racing pistons that use 1/16" top and second rings need .006"- .010" clearance due to their higher expansion rate. Made of 2618 forged 2% silicon/aluminium alloy with 1/16" top and second rings.

The 4032 or VMS-75 high 11% silicon aluminum forgings are more suitable for street and strip use whereas the 2618 2% silicon aluminum forgings are better for boosted and racing engines. If used in a daily driver, low silicon pistons that use 1/16" top and second will have problems with oil control at low RPM or when not at the proper operating temperature. .
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 10-29-2012, 06:59 AM
engineczar's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Sep 2002
Location: In Flowbench nirvana
Age: 52
Posts: 1,630
Wiki Edits: 0

Thanks: 5
Thanked 43 Times in 40 Posts
Quote:
Originally Posted by MouseFink View Post
File fitting makes rings progressively egg shaped.
Huh? Now I've heard everything.
__________________
BSE Racing Engines
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 10-29-2012, 07:22 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,429
Wiki Edits: 0

Thanks: 1
Thanked 16 Times in 16 Posts
Quote:
Originally Posted by MouseFink View Post
Low silicon forged pistons that use 5/64" top and second rings need .002" - .0035" clearance due to a more controlled expansion rate. They are made of 4032 or VMS-75 forged 11% silicon/aluminum alloy with 5/64" top and second rings. Speed Pro L2256F for example

High silicon forged racing pistons that use 1/16" top and second rings need .006"- .010" clearance due to their higher expansion rate. Made of 2618 forged 2% silicon/aluminium alloy with 1/16" top and second rings.

The 4032 or VMS-75 high 11% silicon aluminum forgings are more suitable for street and strip use whereas the 2618 2% silicon aluminum forgings are better for boosted and racing engines. If used in a daily driver, low silicon pistons that use 1/16" top and second will have problems with oil control at low RPM or when not at the proper operating temperature. .
I use alot of 2618 and 4032 material pistons and to date non of them required .002 clearance
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 10-29-2012, 07:46 AM
Registered User
 
Join Date: Jun 2010
Location: TX
Posts: 1,159
Wiki Edits: 0

Thanks: 0
Thanked 101 Times in 93 Posts
Quote:
Originally Posted by engineczar View Post
Huh? Now I've heard everything.
You apparently have never used a bore light to fit the rings in the cylinders.

For winning racing engines, after the cylinders are finish honed with a block plate, then the rings should be select fitted using a bore light as they come out of the box. The ones that do not pass inspection in the bore should be put on the shelf and used later in daily driver engines. .
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 10-29-2012, 07:47 AM
Registered User
 
Last photo:
Join Date: Jul 2004
Location: At Speed
Age: 51
Posts: 1,333
Wiki Edits: 0

Thanks: 2
Thanked 27 Times in 27 Posts
Quote:
Originally Posted by LJM97Z View Post
This is a fairly fresh .030" 406, there is no blow-by, plugs are good & clean, no leaks, but it'll go through about a quart in 150 miles, I'm running baffled VCs with PCV on one & a breather on the other, any ideas?

What is the part number of the rings in question?
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Oil consumption due to possible sucking oil from intake valley..signs ? y2k600f4 Engine 10 07-31-2010 04:40 AM
mysterious SBC oil consumption information Bonhorst Engine 4 01-23-2010 01:35 PM
Last question before SBC off to machine shop (oil consumption) y2k600f4 Engine 5 04-14-2009 12:05 PM
sbc oil consumption help needed jw4413nv Engine 5 05-13-2007 12:41 PM
Excessive oil under valve covers in SBC? TVR383 Engine 13 11-21-2005 12:48 AM


All times are GMT -6. The time now is 07:17 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.